Christmas tree stand



FIG. 1 is a front perspective view of a Christmas tree stand showing my new design;

FIG. 2 is a left side view thereof, the right side being identical;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof. 

The ornamental design for a Christmas tree stand, as shown. 